Double-locked brushing unit and method of making the same



May 23, 1944 D. F. o. WESEMEYER 2,349,644

DOUBLE-LOCKED BRUSHING' UNIT AND METHOD OF MAKING THE SAME Filed May 25, 1943 INVENTOR.

BY MCM/barium ATTO R NYs Patented May 23, 1944 DOUBLE-LOCKED BBUSHING UNIT AND METHOD F MAKING THE SAME Dietrich F. 0. Weseineyer', Euclid, Ohio. assignor Incorporated, Cleveland, Ohio. a corporation of Ohio Application May 25, 1943, Serial No. 488,460

(Cl. 30D- 21) to Spiral Brushes,

12 Claims.

This invention as indicated relates to a double- 1ock finishing unit and method `of making the same. More particularly it comprises a spiral brush wherein a channel strip is firmly engaged,

against a plurality of brushing fibres which are folded about a holding wire locked firmly in the lower portion of the channel strip. The brushing unit is preferably formed into a coil of predetermined size at the time it is being fabricated and at such time the free edges of the channel strip are pressed inwardly so as to engage about the holding wire and its interengaged strand material which projects froml the open portion of the channel. The invention includes the impressing of the terminal portions lof a coiled brushing unit of the type lust mentioned so as to produce in the outer surface of the channel strip around the iinal turn of such stripat each end a series of inwardly extending projections. These projections are of conical shape and are positioned near the upper edge of the outer face of the channel strip around the end turn yand overlie the central portion of the channel strip immediately above the position ofthe holding wire. These projections when formed in the nal turns of the channel strip at each side crimp the channel strip metal more rmly on the material engaged therein, and at the same time prgduce a convex area within the channel strip adjacent each pro- Jection and a concave area on the outer surface of the channel strip at such point. The channel strip will thus be given a corrugated or sinuous structural outline as seen from below the channelstrip, and the holding wire itself will be given a slnuous outline within the final turn of the channel strip at each and. 'The invention, thus, may be said to provide a double-locked brushing unit inasmuch as the projections extending above the holding wire provide one lock of the combination, and the series of bends or corrugations in the holding wire and in the channel strip around its iinal turn provides a corrugated interlock between the holding wire and the channel strip which effectively restrains any slippage or longitudinal movement of the holding wire, and this forms a second locking feature included within the invention as above set forth. The method included in the invention covers the simultaneous forming of the locking projections and the locking corrugations in the structure set forth.

'Ihe principal object of the present invention is to provide an improved brushing unit having a double-locked construction.

Another object of the invention is to provide a method of Wmaking a' brushing unit for use on machine spindles as a replaceable unit wherein such unit has a terminal coil on each end formed with inwardly extending locking projections and simultaneously formed with interlocking corrugations impressed in the channel strip and holdingwire.

Another object of the invention is to reduce the cost and simplify the construction of replaceable units for industrial brushing apparatus, and at the same time make such units doubly secure against injury through failure of the terminal portions thereof;

Another object of the invention is to produce brushing units having a double-locked feature adjacent their terminal portions of greater strength and dependability than where bending and welding operations require the application of intense heat to such terminal areas and parts adjacent thereto.

Another object of the invention is to provide a double-locking terminal area over the nal turn of a helically coiled brushing unit which is distributed throughout the nal turn providing a series of spaced locking structures whereby the operative strains are distributed over a. multi- To the accomplishment ofthe foregoing and related ends, said invention, then, consists of the method and product hereinafter fully described and pointed out in the claims. Y

The annexed drawing and the following description set forth in detail certain steps for carrying out the invention, and one product resulting therefrom, such disclosed method and product illustrating, however,y but several of various applications of the principles of the invention.

In said annexed drawing:

Fig. 1 is a perspective view showing a brushing unit embodying the principles of the invention as seen from the right-hand side of the structure;

Fig. 2 is a view similar to Figure 1 showing said structure as seenl from the left-hand side;

Fig. 3 is an edge view of a brushing coil in position beneath the elements of a power press preliminary to the action of said press against the coils thereof;

Fig. 4 is a View similar to Figure 3 illustrating the coil of the brushing unit after the press acted in compressing relation-thereon;

Fig. is an enlarged fragmentary perspective view illustrating the formation of locking projections and corrugated areas in the brushing strip and holding wire;

Fig. 6 is a diagrammatic view in perspective showing the relative positions of the locking projections formed in the outer walls of the channel strip on each side adjacent the area around the extreme ends of the coil;

Fig. 7 is a fragmentary perspective view showing the corrugations formed in the terminal portion of the holding wire;

Fig. 8 is a reduced diagrammatic view showhas ` ing a brushing unit having a double-locked terminal construction asmounted in operative position on the spindle of a brushing apparatus; and

Fig. 9 is a diagrammatic perspective view showing the end portion of a brushing unit of substantial size and with a large number ofv coil turns intermediate the terminal portions thereof.

The present invention has in view simplifying the construction of brushing units and particularly those adapted for use on the spindles of industrial brushing apparatus, and at the same time insuring the anchorage of the terminal portions of each brushing unit so that the strains imposed thereon are distributed over a number of anchorage points whereby the failure of a single p oint will not ailect the security and dependability of the structure. In addition to forming anchorage elements at spaced intervals about the terminal portions of the brushing unit on each side the productionof such anchorage elements in the form of projections extending across the upper portion of the channel strip around each outside turn deforms the channel strip adjacent the point of each projection and deforms the wire therein at the same time.

It will be noted by reference to Figures 1 and 2 that the brushing unit I is formed of a channel strip 2 having a plurality of radially positioned brushingstrands 3 engaged about a holding wire 4 held deep within the channel strip through the compressing of the free edges of the channel strip in clamping relation to each other. There are also shown at spaced points laround the righthand face of the brush a series of inwardly struck metal areas 5 producing depressions's on the outer surface of the channel strip and the projections 1 within the channel strip. A similar -number of spaced metal areas struck inwardly from the iinal turn of the channel strip on the left-hand side of the brushing unit are formed and thus the final turn of the channel strip on each side is provided with double-lockingelements formed simultaneously over each of said terminal areas.

The method of .forming the inward projections in the nal turns of the,channel strip `of the coil is illustrated in Figures 3 and 4 wherein the brushing unit preliminary to pressing I I, is placed over a central -cylindrical positioning member I2 on the lower plate I3 oi the press after an annular member I4 having a series of upstanding studs I5 has been engaged around said cylindrical member. The brushing unit II is moved around the central member to an extent suicient to position one of said studs in slightly spaced relation from the extreme end of the channel strip minal coil or turn of the channel strip at its upper portion, care being taken that this series of studs I 1 is arranged so as to position one stud at a point slightly removed from the extreme end of the channel strip so as to be an ei'iective terminal anchorage at such point. It will be noted that as shown in Figure 4 the coils within the press after the compression force has been applied will present a series of corrugations impressed in the channel strip and also in the holding wire within the same. 'Ihese corrugations provide a depression 2| adjacent the inwardly struck metal areas-leaving the intermediate portions 22 as outwardly bowed:y areas as shown in Figures 6 and 7 of the drawing. The holding wire 3 is given a curvature 32 to correspond with the depressed areas 2| of the channel strip and the intermediate portions 33 are bowed outward ly, thus giving the wire a series of corrugations, as seen plan view.

The structure illustrated in Figure 5 is diagrammatic in character and shows approximately the appearance of the channel strip adjacent the extreme end portion of the coil after the compressed strip has been opened up and the holding wire and brushing strands removed therefrom, leaving for easy inspection the inwardly projected metal areas above the position of the holding wire and showing the corrugated areas of the channel strip.'

In Figure 8 of the drawing a narrow brushing unit having a corrugated channell strip of a few turns is shown as mounted on a shaft or spindle of an industrial unit, the shaft Il being provided with a shoulder 42 against which a clamping plate 43 having a central recess and a slightly overhanging marginal edge M for engaging over the top edge of the final turn of the channel strip on each side, the companion plate 45 being similar to the plate 43 but turned in the opposite direction.. The end of the shaft is screw-threadedv turns is required the method of making. the same on the under side of the brush. An annular about its under surface is placed against the teris' similar to that above described, the central cylindrical member being of greater height and the members of the press being opened to a greater degree to receive the unit. As is indicated in Figure 3 the pressure against the annular member I6 above the brush is applied by means o! a tubular sleeve or collar 5I bearing against the annular member and acted upon by the upper plate I52 of the press. 'I'he ilnished unit is shown in Figure 9.

The method involved in producing the brushing unit has been indicated in connection with the description of Figures 3 and 4. It is not limited, however, to the use of any particular type of apparatus. 'I'he steps of the method comprise the displacing of metal areas at spaced points around the iinal turn of the channel strip inwardly so as to forma locking projection above the holding wire at such spaced points, and also to form transverse corrugations in both the channel strip and the holding wire within the same. Thus, the holding wire and its associated material cannot move radially by reason of the projections being positioned above the same, and for the further reason that narrow corrugations will lock against radial movement into wider corrugation area. 'I'he transverse corrugations in the channel strip and holding wire will also resist lengthwisemovement relatively to each other.

The inward Aprojections also have a locking movement against lengthwise displacement of the asma channel by reason ofthe engagement fwith the adjacent brushing strands immediately above the holding wire greatly increasing the friction'al engagement of these parts. The method also provides for the steps of simultaneously displacing metal areas at spaced points around the outer side of the coil in the last turn of the channel strip, and at the same time deforming the adjacent area and its enclosed holding wire into transverse corrugations and duplicating these functions and effects on the opposite ilnal turn of the channel strip through the exercise of a single pressure movement.

The method above defined eilects a high speed oi' production and at the same time produces a double-locked structure at each end of the brushing unit which is of greater holding capacity and dependability than structures involving a series of securing operations. It is also pointed out that no welding operations are required and no bending of the holding wire into hooked shape at its ends is necessary. Each of the anchorages distributed at spaced intervals around the ilnal turn of the brush is itself effective as a flnal anchorage and by reason of the eight individual anchorages, as shown, the factor of safety in this type of construction is very large. By placing one ofthese anchorages in closely spaced relation to the extreme end of the channel strip on each side the clamping effect on the material adjacent thereto coupled with the jog or offsetting of the adjacent turn of the channel strip effectively locks the material in the extreme ends of the channel strip against displacement.

While the channel strip has been illustrated in the preferred form wherein the end coils are 'squared with the axis of the brush and the interinner faces to engage the extreme ends of theV channel strip and exert a driving and interlocking pressure on the brushing unit. Such end plates should be provided with'a projecting marginal edge or equivalent structure to securely anchor the unit on the operating shaft or spindle of the brushing apparatus.

Other modes of applying the principle of my invention may be employed instead of those explained, change being made as regards the method and structure herein disclosed, provided the steps and structure included `in the following claims or the equivalent thereof be employed.

I therefore particularly point out and distinctly claim as my invention:

1. The method of making a acume-locked versely adjacent the end turnof saidbrushing unit.

2, The method of making a double-locked brushing unit which comprises forming a hollow cylindrical brush coll of a channel strip with its free upper edges pressed in clamping relation to radial brushing strands engaged centrally over a holding wire secured'within the lower portion of 'said channel strip, which includes the step of brushing unit which comprises forming a hollow cylindrical brush coil -of a channel strip with its free upper edges pressed in clamping relation to radial brushing strands engaged centrally over a vholding wire secured within the lower portion of said channel strip, which includes the step oi displacing inwardly said channel strip and .wire at spaced points around the outer turn of the channel strip at each end simultaneously, forming corrugations in said channel Strip in locking relation with a holding wire, and squaring the end faces of said brushing unit.

4. The method of making a double-locked brushing unit which comprises forming a hollow cylindrical brush coil of a channel strip with its free upper edges pressed in clamping relation to radial brushing strands engaged centrally over a holding wire secured within the lower portion of said channel strip, which includes the step of forcing inwardly at spaced points around the outer turn of the channel strip at each end simultaneously, a plurality of projections from the outer wall of said channel strip in locking relation immediately above the holding wire within said channel strip, and simultaneously forming transverse interlocking corrugations in said channel strip and the area. of holding wire within the same.

5. The method of interlockingly engaging and anchoring the terminal portion of a brushing unit wherein the projecting brushing strands are engaged around a holding wire within a U-shaped channel strip which includes the steps of striking inwardly from one wall of the channel strip at least one transverse projection immediately above the holding wire and simultaneously deforming into transverse interlocking engagement the body of the channel strip and the area of holding wire within the same.

6. An article of the character described having a brushing unit formed of a channel strip brushing u'it which comprises forming a hollow...n cylindrical brush coil of a channel stripgwith its free upper edges pressed in` clamping felation to radial brushing strands engaged centrally-ayer a holding wire secured Within the lower portio'foff said channel strip, which includes the steps of -first forming the channel strip into a coil with clamped about brushing strands engaged about a holding wire within the lower portion of said channel strip, transverse' corrugations in at least the'end portions of said channel strip and holding wlre and pressed metal extensions formed in said a channel strip projecting inwardly from a side wall thereof immediately above said holding wire for locking the said brushing strands and holding wire within said channel strip.

'7. An article of the character described having a brushing unit formed of a hollow cylindrically wound channel strip clamped about brushing strands engaged about a holding wire within the 'lower portion. of said channel strip, transverse corrugations formed in at least the end portions of said channel strip and holding wire and pressed metal extensions within said channel strip lor locking the said brushing strands and holding wire within said channel strip.

8. An article of the character described having a brushing unit formed o! a channel strip clamped about brushing strands engaged about a yholding wire within the lower portion of said channelstrip. transverse corrugations formed in at least the end portions of said channel strip and holdv lngwire the terminal area or said channel strip for locking the said brushing strands and holding wire withinsaid channel strip, end facesat each terminal portion oi' said brushing unit squared to the axis thereof, and transversely displaced areas in the channel strip adjacent said squared end faces.

9.- An article of the character described having a brushing unit formed of a hollow cylindrically wound` channel strip clamped about brushing strands engaged about a holding wire within the lower portion 'oi' said channel strip, and pressed metal extensions at, at least, one point' of each final outer turn of said channel strip projecting inwardly from a side wall thereof immediately above said holding wire for locking the same within said channel strip, and transverse interlocking corrugations .in-said channel strip and ausm Q the lower portion' of said channel strip, and

pressed metal cxtensions'at. at least, one point of each nnaljouter turn of said channel strip projecting inwardly from a side wall thereof immediately above said holding wire for locking the same within said channel strip, and a transverse corrugation in thechannel strip and holding wire adjacent each inward metal extension whereby double-locking action of said interenllsed Darts is effected. 4

' ll. An article of the character described having a brushing unit formed of a hollow cylindrically .wound channel strip clamped about brush-A ing strands engaged about a holdingl wire within 1 the lower portion of said channel strip, 'and pressed metal extensions positioned at a plurality -ot spaced points on each ilnal outer turn ot said channel strip. said extensions projecting inwardly double-locking action is provided holding wire adjacent said pressed metal cxtensions. l0. An article of the character described hav-` ing a brushing unit formed of a hollow cylindri- 4 cally woundchannel strip clamped aboutbrushing strands engaged about a holding wire within engaging said elements and the brushing strandsl ing a brushing unit formed of a channel .stripclamped about brushing strands engagedabout a holding wire within the lower portion of said channel strip, said channel strip and holding wire having adjacent "displaced areas interlockingly intermediate the same.- y DIETRICH F. O. WESEMEYER. 

